Venues / OpenSea

Is OpenSea legit and safe?

OpenSea is a real, operating dex aggregator live since 2017-12. It is non-custodial, KYC: onramp-only, and is backed by Founders Fund, Foundation Capital, Blockchain Capital, Coinbase Ventures and others (seed, after Y Combinator W18); Andreessen Horowitz (a16z), Series B at a $1.5B valuation; Paradigm and Coatue, Series C at a $13.3B valuation. We found 4 reported incidents (listed below). Legit is not the same as low-risk: the coins traded on it can still go to zero.

The checklist

Custody: who holds your money

OpenSea's terms say it never has custody of your assets. You can connect your own wallet, or sign up with email and get an embedded wallet provided by Privy (a third party). Embedded-wallet keys can be exported for EVM and Solana under Settings, Embedded Wallet.

Who backs OpenSea

• Founders Fund, Foundation Capital, Blockchain Capital, Coinbase Ventures and others (seed, after Y Combinator W18) — $2,000,000 (2018-05) source
• Andreessen Horowitz (a16z), Series B at a $1.5B valuation — $100,000,000 (2021-07) source
• Paradigm and Coatue, Series C at a $13.3B valuation — $300,000,000 (2022-01) source

Incidents

• 2022-02-20: Phishing attack on NFT listings. CEO Devin Finzer said 32 users signed a malicious order payload that let an attacker take their NFTs. The attacker's wallet held about $1.7M in ETH from selling them, and OpenSea said the attack did not come from its website. source
• 2022-06-29: Email list leaked by vendor employee. OpenSea said an employee of its email vendor Customer.io misused their access to download and share users' and newsletter subscribers' email addresses, and warned of more phishing emails. source
• 2024-08-28: SEC Wells notice, closed in February 2025. OpenSea said the SEC sent it a Wells notice alleging NFTs on the platform are securities. On 2025-02-21 Finzer said the SEC was closing the investigation without enforcement action. source
• 2025-07-31: Former product manager's conviction vacated. A US appeals court vacated the 2023 wire fraud and money laundering conviction of former OpenSea product manager Nathaniel Chastain, who had bought NFTs before they were featured on the homepage. source

Real downsides

• The 0.5% swap fee is double Matcha's 0.25% on most pairs, before any provider fees.
• NFT sellers pay 1%, and primary drop mints carry a 10% fee.
• Some products, including stock tokens, are not available in the US or UK.
• Past phishing and email-leak incidents, and the SEA token launch has been postponed with no new date.

Can you use it where you live?

OpenSea is a US company (Ozone Networks, Inc.). Its terms (updated 2026-10-20) bar anyone 'located in, ordinarily resident in, or organized under the laws of a U.S.-sanctioned country' and sanctioned persons, and do not name the UK or EU. The mobile launch post says 'Certain products are not available to users in the US, UK and sanctioned jurisdictions', and the help center says stock token trading is not available in the United States. (source)

We report what the venue's own terms say. Don't use a VPN to get around restrictions; venues can freeze accounts that do.

How to use OpenSea without getting scammed

• Only open opensea.io — fake lookalike sites and "support" DMs are the most common way people lose funds on any trading venue.
• Never share a seed phrase or private key. No real support agent will ask for one.
• A referral code only changes your fee and who gets a share of it. It never needs your keys.
• Treat every new memecoin as able to go to zero. A legit venue does not make the coins on it safe.

Comparing options? See the full OpenSea sheet or 1inch, CoW Swap, Jupiter.

More on OpenSea: Overview · Referral code · Fees · Is it legit? · News · Alternatives · US alternatives · Available in the US? · KYC required? · Mobile app? · Custodial? · Supported chains